rare ce gargantuan amphibious beast 

Perception +33; darkvision, low-light vision

Languages Aklo, Common, Draconic

Skills Acrobatics +30, Athletics +36, Intimidation +31, Survival +29

Str +10 Dex +6 Con +10 Int +5 Wis +4 Cha +6

AC  42; all-around vision; Fort +33, Ref +30, Will +27

HP (body) 400

HP (head) 60, multiple heads; Immunities area damage; Weaknesses cold iron; Resistances poison 15

Frightful Presence (aura, emotion, fear, mental) 60 feet, DC 37

Attack of Opportunity [R]

Multiple Heads A creature can attempt to sever one of the orochi's eight heads by specifically targeting it and dealing damage equal to the head's HP. A head not completely severed returns to full HP at the end of the attacking creature's turn. An orochi that loses all of their heads immediately dies.

Multiple Opportunities The orochi gains an extra reaction per round for each of their heads that remains beyond the first, which it can use only to make Attacks of Opportunity. They can't use more than 1 reaction on the same triggering action, and the orochi must use a different head for each Attack of Opportunity.

Speed 30 feet, swim 60 feet

Melee [>] jaws +35 (reach 40 feet), Damage 3d12+18 piercing plus Improved Grab

Melee [>] tail +35 (agile, magical, reach 50 feet), Damage 3d10+18 bludgeoning plus Improved Knockdown

Ranged [>] rock +34 (brutal, range increment 100 feet), Damage 3d8+18 bludgeoning

Orochi Flurry [>>] The orochi makes a number of jaws Strikes equal to the number of their remaining heads, each against a different target. The orochi's multiple attack penalty doesn't increase until after the orochi makes all of their attacks.

Swallow Whole [>] (attack) Huge, 2d12+18 bludgeoning, Rupture 40.

Fists of the Ruby Phoenix #3: King of the Mountain, page 84.